Following in the footsteps of recent Uniqlo collaborators Laura Ashley, Orla Kiely and Lulu Guinness, Birtwell called the retailer "terribly clever", adding how: "You can't misunderstand their clothing, and the atmosphere in Uniqlo shops is very peaceful."

Prices will range from £10 for bags to around £30 for a dress and are worn by British model Portia Freeman in the accompanying campaign.

Manchester-born Birtwell met her future husband, fashion designer Ossie Clark, in the late Fifties and they moved to London where they mixed with an arty crowd and she produced the prints for his flowing, bohemian designs. The couple enjoyed a reputation as one of the capital's coolest couple and were immortalised (along with their cat) by artist David Hockney in his painting Mr and Mrs Clark and Percy. Clark and Birtwell divorced in 1974. The Ossie Clark label has been revived by investors on several short-lived occasions, and is now about to land in Debenhams stores nationwide under the creative direction of Nicholas Georgiou.